The nefarious and perverse act of standing a reasonable distance behind your doubled-over and unsuspecting partner, taking a run up and rifling your sack completely into her anus shouting "CANNONBALL!!!" at the last possible moment. Having knocked her to the ground with your scrotal barrage, proceed to jack off over her back while sitting balls deep on her ass and taunt her by singing shanties. Works best if she's just taken a shower because she'll be prepped, and then have to take another shower after you've demonstrated your pirate-like domination.
Theresa had just got out of the shower when Francois skidded round the corner and launched his nuts with hi-def explosive power into her rectal cavern, heroically crying "CANNONBALL!!!" and then nutted one out all up her back and in her hair. With his cannonballing mission complete, Francois knew the world was safe again.